Assigstob to central alloy steel



Sept. 11, 1928. 1,683,794

w. c. OBRtEN ELECTRIC HAMMER Filed July 27. 1922 3 Sheets-Sheet 1 Um, I J n J gnueniot- #Mm $1M v (1H0: un /a Sept. 11, 1928. W. C. OBRIEN ELECTRI C HAMMER Filed July 27. 1922 3 Sheets-Sheet 2 g wuen fox Sept. 11, 192:; 1 683,794

W. C. O'BRIEN ELECTRIC HAMMER Filed July 27. 1922 3 Sheets-Sheet 3 gnueuloz Patented Sept. 11, 1928 UNKTED s'rarss earner orrics.

ii/ILLIAMCLARENCE OBRIEN, o1 cANTou, onto, ASSIGNOR TO CENTRAL ALLOY STEEL CORPORATION, OF NEW 2 011K,

Y ELECTRIC Application filed July 27,

The present invention relates to improvements in electrically operated drop hammers and has particular application to a doubler foruse in rolling mills for doubling the packs =otsheets.- I i The objects of the invention are to provide a hammer havinga reciprocating head with a solenoid for assisting the force ofgravity in driving the head downward and with a pair of solenoids wired'in parallel, for raising the reciprocating head,- automatically. operating ine'ans ,beingprovided for reducing the'current. to the lifting;.solenoids';.as the head reaches the upper limit of its movement, it

5? being obvious=tl1at less power is required to hold the head in the raised position than required to raise the head from its-lowered posit 1011.-==',1 };.;;Y J

- The above and otherobj ects may beatta'lned by constructing thehamm'er in the form illustrated -in' the accompanying drawings, in Whi h-i I 5 3 -.1;

:Figure l-is aside 'elevationfof a hammer emhodyiing: the inventionshowin g the head in Fig; 2 a glongitudinal -.,--'secti'onalview hr uglnthe ha mesheningthe he l ng he raised position; and

Figi}3;'adiag1'fammtic view ofthe wiring.

Similar numerals indicate corresponding parts throughout the drawings.

The base 1 of the hammer is preferably formed of metal andarranged to be mounted flush with the floor of the mill, in order that the packs of sheets may be slid into position thereon. Standards 2 are rigidly mounted upon the base near opposite ends thereof and provided with the guideways 3 in which the reciprocating head 4 is slidably mounted, said head being preferably formed of iron and provided upon its under face with a plate 5 of brass or other non-magnetic material.

The standards 2 are joined together at their upper ends by a cross plate 6 upon the ends of which are mounted uprights 7 which are connected at their upper ends by a cross plate 8, both of said cross plates being formed of iron or other suitable metal.

A central solenoid 9 for the purpose of forc- 50 in; the head downward, and a pair of solenoids 10 for the purpose of raising the head and holding the same in the ra sed position.

N. Y., A CORPORATION Q1 NEW YORK.

HAMIIVIEB.

1822. Serial No. 577.860.

:1 re located between the plates 6 and 8, being clamped in position therebetween .by means of the nuts 11 upon the upper screw threaded ends of the rods 7.

The solenoids 9 and 10 are insulated from the plates 6 and 8 as indicated at 12 and the solenoids 10 are wired in parallel as shown in the drawings; The plates 6 and 8 are proruled with the openings 13 to receive the cores ll 15 of the solenoids 9 and 10 respectively, said cores being connected toithe upper' side of the reciprocating head' l. c

These cores are, of course, formed of iron, the core 14 hein connected to the reciprocat-. mg head by means of a rod 16 of brass or other non-magnetic material, for the purpose of obtaining the: maximum force of the;blow,-the; core naturally moving to the, center' ofv the solenoid when the same is energized f As shown in diagram in Fig.3, the lifting and holding solenoids 10; are; connected fin parallel, the terminals thereof beingconnected together as by thewires; 17 and'18, the. wire 17 being connected to' the lead wit-e19 byr the wire 20 and thewi'rel8 being connectfij h o.

the lead wire 21. by;tli"ewire 22. .The solenoid-i 9.,is connected to. the lead wire -1 9-by asvir. 23; and to the lead-'wire 21;b ya.wire.24,;a-manu ally, operated; W,itQh;-25 controlling the-Goincuits to the solenoids 9 and 10, indirectly through the relays 34 and 35, being'so arranged that one of said circuits is closed as the other is opened.

Each of the relays 34 and 35 have an armature 36 carrying a blade 37 arranged to close the primary circuit when the secondary or relay circuit energized.

A bracket 26 is mounted upon the upper plate 8 and carries a fixed contact 27 located in the circuit to the solenoids 10, a movable contact 28 being carried upon an arm 29 pivoted as at 30 to the bracket and having :1 depending portion 31 which carries a roller 9 32 arranged to be engaged by the core 14 when the head is in the raised position, whereby the arm 29 is tilted, breaking the direct circuit to the solenoids 10, causing the current to pass through the resistance element 33, thus materially lowering the current passing lhri'mgh the solenoids 10. l

lt will he soon that this device is affected only as the head reaches the upper limit of its stroke, at which time less current will he required to hold the head in the raised position than was required to raise the head from the lowered ;po sition, thus providing for. a material saving in the current acquired to operate the hammer.

fil he operation oi the device may be set forth as follows z i its normal position, the switch 25 w ill close the-circuit to the rela3 35 thereby closing the circuit to the solenoids 10 and the circuit through the contacts 2? and 28 will be broken, deener-gizingthe-relay 38 and causing the current to flou through the resistanoe element'33 to} the solenoids 10, funnishing flonly :sufiicient current' to said solenoids? torheld-the reeipmeatihgfjlread jin' "the raised position.

nwhnithe switch 9i is operated=to close the cirlc u'ittoth rlay 3 l thereby closing th e' cireuit to the sdlenoid 9-, theicircuit it the sure-' noid'slO hroli'en,' rele'a;sii ig tlreha-mm'er and forcing i the same-downw rd 1 upon pack which lias' beezr' p1aeed"'iii"position upon the base 51. *Thcdre l is soilo'cated r'v'ith reference to the retiproc'ati ng'head that the head will contaet' with: thep'ack'*j us't before the core *reache's'the c'er'iter off the'isolenoid 9, thus obtaining-the full torce of'the blow as the s olenoidh'as a natural tendency to draw the core to the cnter' of it-s, field; thus causiiipj the EQCIPFO C-{ItXHg' head to' strike th e packwhen it is' trave 'l ng at the "highest rate'ofed; 4 I

The plate 5 upon thebottom'of the reciproeating head beingfof non-magnetic mat-e ml,

7 thepack 'of-sheets will not beattracted by the head as it is raised. After'the head has reached its lower "position, the switch 25 is ope rated to break the circuit to' the sole iioid 9 and close the circuit' to the solenoids ency to locate in the cen teeof the field as inthe caiseof an' ordinary solenoid; With this construction, the sudden reduction of the cur-'2 reaches the raisedp jsitio'zq'has a'oushioning' effect upon the he'iaiil, 3 preventing thb same from strikinga hard 'blow against the plate'6 and allowingfthe same"to' drop back "a slight distance from said plate as shown Q, in \vhich' po'sition the heads-will belield by the reduced'magaietic'pmrer of the solenoids, as it is obvious that 'onh a'iraction ofthe liitinp' power will be required: to :hold the the raised position. "Iclaim':

An electrically operated hammer inolud'f in}; 7 a reciproeatiiigfi magnetic' head,'' a 851eiioid' for ass sting an elfectlng the working stroke of the head, a pair of solenoids wired in. parallel for lifting the head and holding the e in the raised pos1t1on,'-i .iagnet1c carried by the head and extending" through:

the liftin s lenoids andmeans for automati a a 4 i.

cally reduc ng thccurrent' to theliftmg'solenoids asthc head reaches its upper position XVILLIAM OBRIEN- 

